Two-stroke-cycle motor



Jan. 4, 1927.

H. DICK TWO-STROKE CYCLE IOTOR Filed March 6. 1926 ggg 1 lrmentorPatented Jan. 4, .1927.

4 UNITED STATES HEW)! THOR, OI BQSEBUBG, GERMANY.

TWO-STBOKE-CYOLE MOTOR.

Application filed larch 6, 1926,8er1a11lo. 92,972,and in Germany July 7,1924. I

There are already known two-stroke cycle motors working with separateintroduction of the air and the fuel, with an excess of the fuel,and-with returning of the 5 respective excess. The devices employed forthis purpose, in so far pumps are concerned, are not, however, sodesigned as to be able to serve also as control slides adapted to supplythe cylinder or cylinders with that 1-,. amount of compressed airnecessary for the formation of a proper explosive mixture. Either theworking piston must suck the air required for the formation of theexplosive mixture from below through the crank cas-' l5 ing, or .thatair must be supplied by a separate feed-pump having a separate slideprovided especially for that purpose.

Now, the present invention relates to a two-stroke cycle motor combinedwith a fuel ump so designed that, besides supply: 7 ing t e fuel, it isISO able to act as a con-v trol slide for the compressed air to be mixedwith the fuel. Instead of showin inthe drawing the com lete motor with aits ac- 88 cessories I have eemed it sufiicient to show only thatarrangement and combinationof parts constituting the invention, and thisarrangement and combination is shown in 1011; gitudinal section.

which is rotated continuously by the motor. It may be assumed that themotor be a double-actin two-stroke motor combined with a doub e-actingcompressor, the piston of which is in advance of the working piston byone sixteenth of a revolution.

The earn 6 of the shaft a actuates the plunger d of the fuel pump (1 Itby the intermediary of nuts 0- screwed upon thefree 4a endof said Thewalls of the working cylinder hand of the compressor m are provided withports 0 l8 communicating with apertures of the-cyline On the drawing, adenotes a camr shaftplunger or more precisely of the. projecting. rod ofthe same which" is.

encompassing the'upperend of the cylin er h.

der h, andv the piston is provided with a circumferential groove 13 bywhich the ports 0 are 7 being brought into communication with each otherwhen the plunger has been depressed, the compressed air flowing thenfrom the compressor into the working cylinder. p denotes the packingrings of the plunger, 9 the suction space of the cylinder, r a helicalspring 'bearmg at its upper end on a partition wall havin a centralbore, and at its lower end on the e1 suction valve 3, y is the seat ofor for this valve which is provided with a assage z. The cylinder h or,more precise y, its wall is greatly enlarged at its lower end where itforms a conical bod having two dia onally located bores close atitsouter ends by threaded insertions a: w and enclosing at its innerends balls u and t forming valves pressed on their seats by helicalsprings r r. 0 denotes a nozzle, or nozzle-valve respectively.

The mannerof operatlon of the device is as follows:

Supposin the piston of the compressor be shortly fore its dead centresition, then the plungerd will be dep by the cam band the groove 2'willestablish a communication between the compressor cylinder and theworking cylinder, in consequence whereof the compressed air will flowfrom m to k. Simultaneously with the depression of the plunger, the fuelcontained in the chamber below the plunger will beforced into theworking cylinder through the nozzle 0 until the pressure in the workingcylinder isthe same as that in said chamber. The other art of the fuelis forced awa throu h the ba 1 valve t to the fuel tank. TVhen theplunger has arrived in its lowermost posltion, the 'valve'is'closedagain by the apperining spring 1*. The valve u had c osed already priorthereto by its; appertaining spring, viz, at that point of time the fueland on the other sideby the com pressed air were equal.

Owingto the shape of when the pressures exerted on l one side by the camb the.

plunge'rld returns, under the pressure of the 1 s rin f .into its formerposition not gradu-. al ut suddenly, andsimultaneously there y witli thecommunication between the cylin-- ders m and k is interrupted and fresh.fuel is sucked into the chamber below the plunger. The compress'ed'aircontained in the cylinder is is now enclosed therein as is also the fuelinjected into this cylinder, or

into that compressed air respectively, through the nozzle '2), theworking iston being, at tliis point of time, shortly fore its deadcentre.

Just in this moment the sparking plug causes the ignition and ex losionof the mixture, which burns while t e working piston passes through itsdead centre.

The working piston is now being driven forward and thecompressor pistonsucks another amount of air into the compressor, whereas, at the sametime, the air present on the other side of this piston is compres:e d.The suction valves are opened by the pressure of the atmosphere, andclosed by the for the working cylinder, and two suction valves for thecompressor.

When the working iston has covered seven eighths of its pat the exhaustvalve in front of it which had been 0 n up to the respective point oftime is being closed, and the other fuel pump commences to work exactlyin the manner described in the preceding paragraphs with respect to thepump shown. When then the working piston has arrived in its dead-centreposition, the other exhaust valve is bein opened by the means providedtherefor gm shown) and the gases are permitted to escape.

I claim:

A two-stroke cycle motor,v com rising, in combination with the workingcy inder and the compressor cylinder, a fuel pump so designed as to beadapted to serve alsoas control slide for the compressed air on its pathfrom the compressor cylinder to the working cylinder, substantially asset forth.

HERMANN DICK.

